81258074 has 8 divisors (see below), whose sum is σ = 122966100. Its totient is φ = 40269376.

The previous prime is 81258071. The next prime is 81258091. The reversal of 81258074 is 47085218.

It can be written as a sum of positive squares in 2 ways, for example, as 80227849 + 1030225 = 8957^2 + 1015^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81258071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179549 + ... + 180000.

Almost surely, 2^81258074 is an apocalyptic number.

81258074 is a deficient number, since it is larger than the sum of its proper divisors (41708026).

81258074 is a wasteful number, since it uses less digits than its factorization.

81258074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359664.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 81258074 is about 9014.3260424726. The cubic root of 81258074 is about 433.1338988917.

The spelling of 81258074 in words is "eighty-one million, two hundred fifty-eight thousand, seventy-four".